生产者和消费者

管程法

利用缓冲区来解决生产者消费者问题

/**
 * 生产者消费者之管程法
 */
    public static void main(String[] args) {
        //缓冲区
        SynContainer synContainer = new SynContainer();
        new Producer(synContainer).start();
        new Consumer(synContainer).start();
    }
}

//产品
class Product {
    int id;

    public Product(int id) {
        this.id = id;
    }
}

//生产者
class Producer extends Thread {
    //缓冲区对象
    SynContainer container;

    public Producer(SynContainer container) {
        this.container = container;
    }

    //生产
    @Override
    public void run() {
        for (int i = 0; i < 100; i++) {
            //调用生产方法
            container.push(new Product(i));
            System.out.println("生产了" + i + "产品");
        }
    }
}

//消费者
class Consumer extends Thread {
    SynContainer container;

    public Consumer(SynContainer container) {
        this.container = container;
    }
    //消费

    @Override
    public void run() {
        for (int i = 0; i < 100; i++) {
            System.out.println("消费了" + container.pop().id + "产品");
        }
    }
}

//缓冲区
class SynContainer {
    //容器
    Product[] products = new Product[10];
    //容器计数器
    int count = 0;

    //生产者生产
    public synchronized void push(Product product) {
        //判断是否已经达到生产满了,满了就等待，让消费者消费
        if (count == products.length) {
            try {
                this.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        //开始生产并将产品放入容器
        products[count] = product;
        //计数
        count++;
        //通知消费者消费
        this.notifyAll();
    }

    //消费者消费(需要返回消费数量）
    public synchronized Product pop() {
        //判断是否有产品可以消费,没有就等待，通知生产者生产
        if (count == 0) {
            try {
                this.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        //开始消费
        count--;
        //返回消费信息
        Product product = products[count];
        //通知生产者生产
        this.notifyAll();
        return product;
    }